Posts filed under ‘Infecciones virales’

Viral and bacterial co-infection in pneumonia: do we know enough to improve clinical care?

Crit Care. 2017 Jan 26;21(1):19.

Cawcutt KA1, Kalil AC2,3.

Author information

1 Department of Internal Medicine, Division of Infectious Diseases, University of Nebraska Medical Center, Omaha, NE, USA.

2 Department of Internal Medicine, Division of Infectious Diseases, University of Nebraska Medical Center, Omaha, NE, USA.

3 University of Nebraska Medical Center, 985400 Nebraska Medical Center, Omaha, NE, 68198, USA.



March 20, 2018 at 8:49 am

Fatal Yellow Fever in Travelers to Brazil, 2018

Davidson H. Hamer, MD; Kristina Angelo, DO; Eric Caumes, MD; et al.

La FA enfermedad potencialmente mortal se puede prevenir con la vacunación. Hasta el 15/03/2018, un total de 10 viajeros no vacunados a Brasil habían adquirido FA este año, y cuatro de los 10 habían muerto (40%).

Estos viajeros estaban visitando desde Argentina, Chile, Francia, Alemania, Holanda, Rumania y Suiza.



March 17, 2018 at 11:15 am

Seroprevalence and risk factors of Hepatitis E infection in Jordan’s population: First report

International Journal of Infectious Diseases January 2018 V.66 P.121–125

Mohammad M. Obaidat, Amira A. Roess


  • Seroprevalce, risk factors and zoonotic potential of HEV were studied.
  • HEV antibodies occurs at high prevalence (30.9%) overall in Jordan.
  • HEV infection associates with age and eating undercooked meat.
  • Owning camels increased the odds of HEV seropositivity.


Hepatitis E virus (HEV) is hyperendemic in many countries, but data on this virus are not available in Jordan. This study determined the seroprevalence, risk factors and zoonotic potential of HEV in a Jordanian population.


A total of 450 sera samples from 8 different governorates were tested for HEV-IgG. A pre-tested and validated questionnaire was used to collect risk factor data including animal interaction and environmental exposures.


The overall seroprevalence was 30.9%. Eating undercooked meat was significantly associated with HEV seropositivity (OR = 2.06, 95%CI 1.04–4.06) after controlling for age, gender, travel history and source of water. Age was also associated with HEV seropositivity; the youngest (≤14 years of age) and oldest age groups (60 and 80 years of age) had the highest prevalence (45.5% and 53.2%, respectively), compared to those between 20 to 29 years of age and 30 to 39 years of age (20.2 and 15.2%, respectively), although the small sample size among the youngest group tempers this association. There was evidence of a marginal association between owning camels and an increased odds of HEV seropositivity. Place of residence and source of drinking water were not associated with infection.


This is the first study to report HEV seroprevalence in Jordan and shows that HEV exposure is high in Jordan. Surveillance for acute and chronic Hepatitis E is needed to estimate the frequency of the actual disease.



February 10, 2018 at 9:14 am

Adenovirus Type 4 Respiratory Infections among Civilian Adults, Northeastern United States, 2011–2015

Emerg Infect Dis. 2018 V.24 N.2 P.201-209

Adriana E. KajonComments to Author , Daryl M. Lamson, Camden R. Bair, Xiaoyan Lu, Marie L. Landry, Marilyn Menegus2, Dean D. Erdman, and Kirsten St. George

Author affiliations: Lovelace Respiratory Research Institute, Albuquerque, New Mexico, USA (A.E. Kajon, C.R. Bair); New York State Department of Health, Albany, New York, USA (D.M. Lamson, K. St. George); Centers for Disease Control and Prevention, Atlanta, Georgia, USA (X. Lu, D.D. Erdman); Yale University School of Medicine, New Haven, Connecticut, USA (M.L. Landry); University of Rochester Medical Center, Rochester, New York, USA (M. Menegus)


Human adenovirus type 4 (HAdV-4) is most commonly isolated in military settings. We conducted detailed molecular characterization on 36 HAdV-4 isolates recovered from civilian adults with acute respiratory disease (ARD) in the northeastern United States during 2011–2015.

Specimens came from college students, residents of long-term care facilities or nursing homes, a cancer patient, and young adults without co-morbidities.

HAdV-4 genome types 4a1 and 4a2, the variants most frequently detected among US military recruits in basic training before the restoration of vaccination protocols, were isolated in most cases.

Two novel a-like variants were recovered from students enrolled at a college in Tompkins County, New York, USA, and a prototype-like variant distinguishable from the vaccine strain was isolated from an 18-year-old woman visiting a physician’s office in Ulster County, New York, USA, with symptoms of influenza-like illness. Our data suggest that HAdV-4 might be an underestimated causative agent of ARD among civilian adults.





February 9, 2018 at 6:47 pm

Hepatitis E virus infection as a promoting factor for hepatocellular carcinoma in Cameroon: Preliminary Observations

International Journal of Infectious Diseases November 2017 V.64 N. P.4–8

Marie Amougou Atsama, Paul Jean Adrien Atangana, Dominique Noah Noah, Paul Fewou Moundipa, Pascal Pineau, Richard Njouom



To determine the seroprevalence of hepatitis E virus (HEV) infection in patients with chronic hepatitis and/or hepatocellular carcinoma (HCC) and to assess its potential consequences for disease progression.


We conducted a prospective case-control study on patients with HCC hepatitis B or C related and non-HCC patients including patients with CLD and patients without clinical evidence of liver disease. Anti-HEV IgG and IgM were tested by ELISA using commercially available kits. Liver damage was assessed by alanine aminotransferase, aspartate aminotransferase, platelets and prothrombin measurements.


We observed a significant anti-HEV IgG carriage in HCC patients compared to non-HCC subjects with CLD (41.8% vs 12.6%; P = 9.1 E-6; OR = 4.8, 95%CI: 2.3-10.6). HCC patients with HEV infection display more profound alterations of circulating liver enzymes, platelets count and prothrombin time than HCC patients without sero-reactivity to HEV.


Overall, this study indicates a high prevalence of HEV infection in Cameroonian patients with CLD and HCC. These data suggest either that patients with liver tumors are more susceptible to hepeviral infection or that, in a tropical context, HEV might promote the progression of liver diseases towards tumor.



February 9, 2018 at 1:17 pm

Infectious virus in exhaled breath of symptomatic seasonal influenza cases from a college community.

Proc Natl Acad Sci U S A 2018 Jan; 115:1081.

Yan J et al


Lack of human data on influenza virus aerosol shedding fuels debate over the importance of airborne transmission. We provide overwhelming evidence that humans generate infectious aerosols and quantitative data to improve mathematical models of transmission and public health interventions. We show that sneezing is rare and not important for—and that coughing is not required for—influenza virus aerosolization. Our findings, that upper and lower airway infection are independent and that fine-particle exhaled aerosols reflect infection in the lung, opened a pathway for a deeper understanding of the human biology of influenza infection and transmission. Our observation of an association between repeated vaccination and increased viral aerosol generation demonstrated the power of our method, but needs confirmation.


Little is known about the amount and infectiousness of influenza virus shed into exhaled breath. This contributes to uncertainty about the importance of airborne influenza transmission. We screened 355 symptomatic volunteers with acute respiratory illness and report 142 cases with confirmed influenza infection who provided 218 paired nasopharyngeal (NP) and 30-minute breath samples (coarse >5-µm and fine ≤5-µm fractions) on days 1–3 after symptom onset. We assessed viral RNA copy number for all samples and cultured NP swabs and fine aerosols. We recovered infectious virus from 52 (39%) of the fine aerosols and 150 (89%) of the NP swabs with valid cultures. The geometric mean RNA copy numbers were 3.8 × 104/30-minutes fine-, 1.2 × 104/30-minutes coarse-aerosol sample, and 8.2 × 108 per NP swab. Fine- and coarse-aerosol viral RNA were positively associated with body mass index and number of coughs and negatively associated with increasing days since symptom onset in adjusted models. Fine-aerosol viral RNA was also positively associated with having influenza vaccination for both the current and prior season. NP swab viral RNA was positively associated with upper respiratory symptoms and negatively associated with age but was not significantly associated with fine- or coarse-aerosol viral RNA or their predictors. Sneezing was rare, and sneezing and coughing were not necessary for infectious aerosol generation. Our observations suggest that influenza infection in the upper and lower airways are compartmentalized and independent.



February 8, 2018 at 8:40 pm

Rhinovirus Viremia in Patients Hospitalized With Community-Acquired Pneumonia

The Journal of Infectious Diseases  November 27, 2017 V.216 N.9 P.1104–1111    

Xiaoyan Lu; Eileen Schneider; Seema Jain; Anna M Bramley; Weston Hymas


Rhinoviruses (RVs) are ubiquitous respiratory pathogens that often cause mild or subclinical infections. Molecular detection of RVs from the upper respiratory tract can be prolonged, complicating etiologic association in persons with severe lower respiratory tract infections. Little is known about RV viremia and its value as a diagnostic indicator in persons hospitalized with community-acquired pneumonia (CAP).


Sera from RV-positive children and adults hospitalized with CAP were tested for RV by real-time reverse-transcription polymerase chain reaction. Rhinovirus species and type were determined by partial genome sequencing.


Overall, 57 of 570 (10%) RV-positive patients were viremic, and all were children aged <10 years (n = 57/375; 15.2%). Although RV-A was the most common RV species detected from respiratory specimens (48.8%), almost all viremias were RV-C (98.2%). Viremic patients had fewer codetected pathogens and were more likely to have chest retractions, wheezing, and a history of underlying asthma/reactive airway disease than patients without viremia.


More than 1 out of 7 RV-infected children aged <10 years hospitalized with CAP were viremic. In contrast with other RV species, RV-C infections were highly associated with viremia and were usually the only respiratory pathogen identified, suggesting that RV-C viremia may be an important diagnostic indicator in pediatric pneumonia.



January 31, 2018 at 11:16 pm

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